Abstract
Different micromechanical models for determining the stiffness and thermal expansion coefficients of short-fibre-reinforced thermoplastics are compared. For unidirectional orientation the model of Tandon and Weng, the self-consistent scheme and the Halpin–Tsai equations are used. The extension to arbitrary fibre orientation is done by orientation averaging of stiffnesses, compliances and so called `concentration' tensors. For the latter the orientation averaging procedure is extended with the help of orientation tensors to non-symmetric, transversly isotropic tensors. Furthermore, simplifications concerning the material symmetry are given, allowing the use of the classical thin-laminate theory to describe the composite. Finally, the values calculated with the different theories are compared with measurements on specimens from a specially designed experimental component. In this way it is possible to investigate different fibre orientation states, which are characteristic for injection-moulded short-fibre-reinforced components.
Published Version
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